<html>
  <body>
    <script language="Javascript">
      alert(/my regexp/.matches('hello, world!'));
      alert(/<html>/.matches('hello, world!'));
      alert(/<body/.matches('hello, world!'));
      alert(/"/ig.matches('hello, world!'));
      alert(/'/ig.matches('hello, world!'));
    </script>
  </body>
</html>